Results 1 to 6 of 6

Thread: Ignition timing

  1. #1
    Join Date
    Feb 2010
    Location
    Nor Cal
    Boat
    Searay
    Details
    Searay sorrento s23
    Engine(s)
    5.7 260 hp mercruiser w/ aplha 1 "r" drive
    Posts
    20

    Ignition timing

    Ok , 1988 s23, 5.7. Is settingthe timing as simple as hooking up my timing light to #1 ignition wire and setting the base timing to 8 degrees? I checked it shortly after I bought the boat and it was set like at 12 or so BTDC.... please advise on proper method to adjust timing..


    Thanks

    Tony

  2. #2
    Join Date
    Feb 2007
    Location
    Milwaukee, Wi
    Boat
    Searay
    Details
    270 DA
    Engine(s)
    twin 470 Mercruisers
    Posts
    148

    Re: Ignition timing

    Make sure your dwell(point gap) is correct, and you are at the correct idle rpm. Then when you get the timing correct, check the advance timing also.

    Milwaukee, Wi
    1982 270 DA
    1973 240 Weekender(sold)

  3. #3
    Join Date
    Feb 2010
    Location
    Nor Cal
    Boat
    Searay
    Details
    Searay sorrento s23
    Engine(s)
    5.7 260 hp mercruiser w/ aplha 1 "r" drive
    Posts
    20

    Re: Ignition timing

    no points, Its a thunderbolt electronic setup. Do I still have to check advance timing? how do I do that?

  4. #4
    Join Date
    Apr 2010
    Location
    Lake Travis
    Boat
    Sea Ray
    Details
    340 Sundancer 2000
    Engine(s)
    Twin 7.4L V-drives
    Posts
    582

    Re: Ignition timing

    You just need to be sure the timing advance is in whatever state Mercruiser wants it in for the timing to be checked. More than likely, that just means at an idle, but you should check the manual (or perhaps someone lurking knows).

  5. #5
    Join Date
    Mar 2010
    Location
    Lake Erie
    Boat
    between boats
    Details
    Correct crafts (2) Wellcraft Nova
    Engine(s)
    BBC, BBC
    Posts
    124

    Re: Ignition timing

    at idle, marine engines use flyweights to advance timing inside of the distributor so you want to make sure the timing isn't advancing, simply on the older stuff check at idle, keep your light on the marks and raise the rpms to insure the timing advances with rpm and you will see this at the marks, distributors have been known to rust up and and break the flyweight springs and so on, so always take a look under the roter for broken springs and rust...thats what advances the timing for the engine unlike a car which uses vacuum advance timing

  6. #6
    Join Date
    Dec 2007
    Location
    Kill Devil Hills, NC
    Boat
    Sea Ray
    Details
    1996 270 Sundancer
    Engine(s)
    New twin 4.3's - 235hp each with Alpha 1 Gen 2 Drives
    Posts
    1,652

    Re: Ignition timing

    Depending on which Thunderbolt ignition you have, you may need to ground the timing wire. I have the Thunderbolt V and it's a purple/white wire. When you ground this it prevents the electronics from trying to adjust the timing at the same time you're making the base adjustments. What I've always done is ground it with the engine off and remove the ground with the engine off so you don't damage anything.
    <img src=http://i298.photobucket.com/albums/mm268/tdappleman/boatatsunsetgrill.jpg border=0 alt= />
    Travis Appleman
    Kill Devil Hills, NC
    "Something Fishy"
    ASE Certified Technician
    www.coastalfastlube.com

Similar Threads

  1. Ignition switch trips ignition breaker
    By charpold in forum General Maintenance/Repair Questions
    Replies: 0
    Last Post: 03-07-2011, 01:19 PM
  2. timing advance 86 350 with thunderbolt IV ignition
    By lime4x4 in forum Gas Engines/Drives/Transmissions/Props
    Replies: 8
    Last Post: 03-30-2009, 08:11 AM
  3. 7.4 Timing Tab
    By 67vetteal in forum General Discussion
    Replies: 2
    Last Post: 08-30-2008, 12:43 PM
  4. 7.4 Timing Tab
    By 67vetteal in forum Gas Engines/Drives/Transmissions/Props
    Replies: 0
    Last Post: 08-29-2008, 09:51 PM
  5. Timing a 7.4 in a '96 290
    By icu812 in forum General Maintenance/Repair Questions
    Replies: 8
    Last Post: 02-08-2008, 12:51 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •